Question: how would I know when to use a one sided t distribution or a one sided z distribution in question? ex:The CEO of a large

  1. how would I know when to use a one sided t distribution or a one sided z distribution in question? ex:The CEO of a large electric utility claims that 75 percent of his 1,000,000 customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers, using simple random sampling. Among the sampled customers, 73 percent say they are very satisified. Based on these findings, can we reject the CEO's hypothesis that 75% of the customers are very satisfied? Use a 0.05 level of significance.

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